TMC is an independent, primarily volunteer organization that relies on ad revenue to cover its operating costs. Please consider whitelisting TMC on your ad blocker and becoming a Supporting Member. For more info: Support TMC

Battery Pack becomes slightly out of balance overnight?

Discussion in 'Roadster: Technical' started by sethr, Aug 7, 2015.

  1. sethr

    sethr CPO Roadster #1089

    Joined:
    Mar 24, 2013
    Messages:
    190
    Location:
    Fairfax, VA
    Hi all: I wonder if anyone can shed light on what I have noticed recently (I've never checked this before the last couple of days). After a Standard charge at the end of the day, my pack balances in a short time, usually in about 10 - 15 minutes. But recently, when I was checking on the pack temperature in the morning, I saw that the balancing grid had a few "1's". It rebalanced in minutes (I assume because I had woken the Roadster up: the pump had not been on), but I'm wondering if this is normal, or the beginning of a problem? TIA!
     
  2. spaceballs

    spaceballs Member

    Joined:
    Sep 17, 2013
    Messages:
    583
    Location:
    Sammamish
    That is normal.
     
  3. BartJ

    BartJ Member

    Joined:
    Dec 13, 2014
    Messages:
    450
    Location:
    Belgium
    Personally I have never seen any 1's in the balancing grid at all
     
  4. djp

    djp Roadster 2.0 VIN939

    Joined:
    Aug 28, 2011
    Messages:
    1,115
    Location:
    Toronto, Canada
    You need to catch them during a balancing cycle, directly after completing a Standard or Range charge. They're cleared out when you start the car.
     
  5. hcsharp

    hcsharp Active Member

    Joined:
    Jun 7, 2011
    Messages:
    2,944
    Location:
    Vermont
    I've never seen my car "re-balance" after it finishes balancing. Maybe I've missed it. If you top-off the charge it will enter a balancing stage afterwards. But I've never seen it start balancing just because it woke up.
     
  6. MLAUTO

    MLAUTO Member

    Joined:
    Mar 8, 2014
    Messages:
    492
    Location:
    SW Florida
    Check the min and max brick voltages. Balancing will start after a few minutes after the key is turned off (or when you awaken it) when the SOC is 79% or greater, and the difference between the high and low voltages is >.02V. Balancing only occurs while awake. If your pack is out of balance, you can turn on the hazard flashers to keep the car awake until the pack is balanced. A few "1's" are good. If you see 98, then you have a problem.
     

Share This Page

  • About Us

    Formed in 2006, Tesla Motors Club (TMC) was the first independent online Tesla community. Today it remains the largest and most dynamic community of Tesla enthusiasts. Learn more.
  • Do you value your experience at TMC? Consider becoming a Supporting Member of Tesla Motors Club. As a thank you for your contribution, you'll get nearly no ads in the Community and Groups sections. Additional perks are available depending on the level of contribution. Please visit the Account Upgrades page for more details.


    SUPPORT TMC